Gregerson is 3 for 4 in save chances with a 1.69 ERA, a 0.75 WHIP over 5 2/3 innings pitched since earning a role in Oakland's closer-by-committee approach.
Chavez has allowed just one earned run in each of his first four starts. He owns a 1.38 ERA, a 0.92 WHIP with 28:5 K:BB ratio over 26 innings pitched. He will start again against the Astros, this time in Houston on Friday.
Peacock owns a 6.14 ERA, a 1.91 WHIP along with 15:11 K:BB ratio over 14 2//3 innings pitched. He will get another crack at the Athletics at home on Friday.
Gonzalez left the game in the seventh inning with the injury and was replaced by Drew Stubbs. He finished 1 for 4 with two runs scored and one RBI before the injury. He is hitting .282 with four homers and 14 RBI this season. His status remains uncertain Monday against San Francisco.
Danks took Robbie Ross deep for a two-run home run in the third inning. He finished 1 for 4 with one walk, two runs scored and two RBI in a 16-2 win. He has just two hits in his first 15 at-bats to start the season.
Semien also singled in the third, eighth and ninth innings, respectively. He finished 4 for 6 with two runs and four RBI. He is hitting .222 with just two homers and nine RBI in 81 at-bats.
Ross served up two-run homers to Jordan Danks and Jose Abreu. He was charged with seven runs -- four earned -- on seven hits and no walks while striking out eight in 5 1/3 innings. He tossed 86 pitches, 65 of which were strikes.
Ross owns a 2.31 ERA, a 1.24 WHIP and 21:8 K:BB ratio over 23 1/3 innings pitched. He will return to the mound Saturday at Seattle.